Sterilizer.



W. J. BELL.

STERILIZER.

APPLICATION FILED AN. 2, 1012.

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STERILIZEB.

Specification of Letters Patent. t t d .j l 1 191 2,

Application filed January 2, 1912. "serial no. 669,120.

ject thereof is to produce a sterilizer in which the liquid may be quickly heated to the sterilizing point and which will automatically break the circuit of the heating element in case the liquid should be evaporated from,

the vessel to a certain predetermined level thus preventing injury to the liquid receptacle. I accomplish this object by the device described herein and illustrated in the ac- I companying drawings in which;

Figure 1 is a fragmentary side elevation with parts broken away for olearness of illustration. Fig. 2 is an end elevation of.

the base, and a cross section of the sterilizing tank, on the line 2-2 of Fig. 1. Fig. 3 is a diagrammatic view of the wiring and connection of parts. Fig. 4: is a cross section of the solenoid.

In the drawings is a rectangular vessel preferably of sheet metal and 11 is a removable cover for the same. The bottom'13 is corrugated to form troughs 14. At one end these troughs have sloping ends that slope downwardly to the bottom as shown in Fig.

1 so that the liquid in the vessel can clrculate evenly between the corrugations. EX- tending transversely to the vessel at each end thereof are bars 15 of'insulating material to which are secured the major heating coils 16 which are connected ins cries. These coils extend through the troughs in the bottom and are insulated therefrom by sheet asbestos 19. One end of these coils is connect ed to the return wire 17 and the'other end is connected to contact 18. Adj acent to bars 15 are bars 20 likewise of insulating material to which are. connected minor coils 21, which areinsulated from the major coils by a sheet of asbestos 22. These coils are connected in series and are also connected at one end to contact 23 and at the other end to contact 18. A sheet of metal 23 is secured to the vessel and supports the coils. This metal sheet is insulated-from the minor coils by a sheet of to contact spring. 26 which spring is'secured to the base 27. The base is preferably of insulating material but if not of insulating material, the feed wire and all contacts are insulated therefrom. A like and oppositely disposed contact spring 28 is also secured to contact 29 and also to the coils of the solenoid magnet 30:

A switch 29 is carried by contact 29 which can be turned so as to connect either corp tact- 23 or 18 and thereby utilize both coils or only the major coils. The plunger of the magnet is composed of an ironrod 31 which contact ring 32 which is insulated from the rod. Thls contact ring normally engages tends normally to about the'center of the 33 which normally extends to the surface of the base. The other end .of the coils of the solenoid is connected to a contact 34 which is secured to the end of float tank 35. A like contact36 is secured to the other end of the float tank and is connected to the return wire. Near the bottom of the float tank is a hose ports connect the float tank with the always the same inboth. In the float tank is a float 39 which is preferably cylindrical -in shape. At each end ofthe float are wires 40 which have an adjusting curve 41 1' near the top thereof. Wires 40, are. connected to a cross bar or wire 42 which? cross bar connects contacts 34 and 36 when the liquid in the tanks falls below a certain predetermined level and thereby closes the shunt circuit which energizes the magnet.

As soon as the magnet is energizedthe plunger withdraws contact ring 32 fr hm its engagement with contact springs 26 and 28 cuit is opened and the current to the instrument is automatically broken thereby prethe operator pushes the core of the magnet ready for use.

lVhile I have shown my device applied as a sterilizing device it may be used in evapasbestos The feed wire 25 is connected the base. Contact spring 28 is connected to contact springs 26 and 28. The iron rod eX- coils and is there connected ,to a brass rod and the main circuit as well as the shunt cirprojects in front of the coils and carries a' port 37 and nearjhe top thereof is'a port 38.

sterilizing tank so that the liquid level is venting injury thereto. When the tanks are refilled the float opens the shunt circuit and.

to its normal position thereby closing the main circuit when theinstrume'nt is again ically to cut oil the v 111 means com risin a li uid eva oratin b b b the same; a normal tank; resistance coils for heating the c0ntents of the tank, a normallyclosed circuit for operating the resistance coils, said circuit having a movable switch for breaking y open shunt circuit connected with the main circuit and having a magnet therein, said magnet being connected to the switch inthe main'circuit and means operable by the fall of liquid. in the tank to close the shunt circuit whereby the main and shunt circuit are both broken.

2. In a liquid evaporating device, a liquid evaporating tank; electrical means for heating the contents thereof comprising major and minor coils; means for connecting and disconnecting the minor coils from the major coils, a main circuit fonoperating said coils; a normally open shunt circuit con nected. to the main circuit; and means operable by the fall of liquid in the tank to close the shunt circuit and open both the main and shunt circuits.

In Witness that I claim the for-egoint;- l have hereunto subscribed my name this 23rd day or" December, 1911.

lvillfllhlll J) BELT I. Witnesses:

G. l lAurrmiu, FRANK Wxrnmunnn.

, (Copies of t? S'PateT/i) may be obtained for five cents each. by addressing the Commissioner of Patents,

' Washington, D. G. 

